Effect of surfactant tail length and ionic strength on the interfacial properties of nanoparticle–surfactant complexes

Soft Matter ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 112-123 ◽  
Author(s):  
Stephanie M. Kirby ◽  
Shelley L. Anna ◽  
Lynn M. Walker
Keyword(s):  
Ionic Strength ◽  
Colloidal Stability ◽  
Tail Length ◽  
Interfacial Properties ◽  
Stabilizing Agents ◽  
Surfactant Systems

Mixed nanoparticle–surfactant systems are effective foam stabilizing agents, but the lack of colloidal stability of the bulk dispersions makes interfacial characterization challenging.

Evaluation of effects of pH and ionic strength on colloidal stability of IgG solutions by PEG-induced liquid-liquid phase separation

2016 ◽  
Vol 145 (18) ◽  
pp. 185101 ◽  
Author(s):  
Ronald W. Thompson ◽  
Ramil F. Latypov ◽  
Ying Wang ◽  
Aleksey Lomakin ◽  
Julie A. Meyer ◽  
...  
Keyword(s):  
Phase Separation ◽  
Ionic Strength ◽  
Liquid Phase ◽  
Colloidal Stability ◽  
Liquid Phase Separation ◽  
Effects Of Ph ◽  
Liquid Liquid Phase Separation

Importance of 1:3 Molecular Ratio on the Interfacial Properties of Mixed Surfactant Systems

Langmuir ◽  
1999 ◽  
Vol 15 (21) ◽  
pp. 7403-7405 ◽  
Author(s):  
Alexander Patist ◽  
Surekha Devi ◽  
Dinesh O. Shah
Keyword(s):  
Interfacial Properties ◽  
Mixed Surfactant ◽  
Molecular Ratio ◽  
Mixed Surfactant Systems ◽  
Surfactant Systems

scholarly journals Dispersion State Phase Diagram of Citrate-Coated Metallic Nanoparticles in Saline Solutions

2020 ◽  
Author(s):  
Sebastian Franco Ulloa ◽  
Giuseppina Tatulli ◽  
Sigbjørn Løland Bore ◽  
Mauro Moglianetti ◽  
Pier Paolo Pompa ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Metallic Nanoparticles ◽  
Colloidal Stability ◽  
Particle Dispersion ◽  
Free Energy Calculations ◽  
Coarse Grained ◽  
Solvent Accessible Surface Area ◽  
Vis Spectroscopy ◽  
Dispersion State ◽  
Saline Solutions

The fundamental interactions underlying citrate-mediated chemical stability of metal nanoparticles (NPs), and their surface characteristics dictating particle dispersion/aggregation in aqueous solutions, are largely unclear. Here, we used a newly developed theoretical model to estimate the stoichiometry of citrate molecules chemisorbed onto spherical metallic NPs and define the uncovered solvent-accessible surface area of the NP. Then, we exploited two-body free energy calculations and extended coarse-grained molecular dynamics simulations of citrate-capped metallic NPs in saline solutions to explore an experimentally relevant range of NP charge, as well as the electrolytic medium’s ionic strength, a known trigger for aggregation. In this way, we define dispersion state phase diagrams of citrate-capped metal nanocolloids. UV-vis spectroscopy experiments validated our predictions and extended our results to NPs up to 35 nm. Altogether, our results disclose a complex interplay between the particle size, its surface charge density, and the ionic strength of the medium, which ultimately clarifies how these variables impact colloidal stability. <br>

scholarly journals Self‐Assembly of Proteinaceous Shells around Positively Charged Gold Nanomaterials Enhances Colloidal Stability in High‐Ionic‐Strength Buffers

ChemBioChem ◽  
2019 ◽  
Vol 21 (1-2) ◽  
pp. 74-79
Author(s):  
Eita Sasaki ◽  
Ryan M. Dragoman ◽  
Shiksha Mantri ◽  
Dmitry N. Dirin ◽  
Maksym V. Kovalenko ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Self Assembly ◽  
Colloidal Stability ◽  
High Ionic Strength ◽  
Gold Nanomaterials ◽  
Positively Charged

scholarly journals The influence of ionic strength and mixing ratio on the colloidal stability of PDAC/PSS polyelectrolyte complexes

Soft Matter ◽  
2015 ◽  
Vol 11 (37) ◽  
pp. 7392-7401 ◽  
Author(s):  
Yanpu Zhang ◽  
Erol Yildirim ◽  
Hanne S. Antila ◽  
Luis D. Valenzuela ◽  
Maria Sammalkorpi ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Colloidal Stability ◽  
Mixing Ratio ◽  
Polyelectrolyte Complexes ◽  
Over Time

Over time, polyelectrolyte complexes aggregate, dissolve, or remain colloidally stable.

Foam stability and interfacial properties of milk protein?surfactant systems

2005 ◽  
Vol 19 (3) ◽  
pp. 467-478 ◽  
Author(s):  
S ROUIMI ◽  
C SCHORSCH ◽  
C VALENTINI ◽  
S VASLIN
Keyword(s):  
Milk Protein ◽  
Foam Stability ◽  
Interfacial Properties ◽  
Surfactant Systems

scholarly journals Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2939
Author(s):  
Dantong Lin ◽  
Liming Hu ◽  
Irene M. C. Lo ◽  
Zhigang Yu
Keyword(s):  
Ionic Strength ◽  
Size Distribution ◽  
Environmental Conditions ◽  
Colloidal Stability ◽  
Removal Rate ◽  
Phosphate Removal ◽  
Zero Valent Iron ◽  
Removal Capacity ◽  
Nano Zero Valent Iron ◽  
Ph Conditions

Nano zero-valent iron (nZVI) has been considered as a promising material for groundwater remediation in the past few decades. The size distribution of nZVI is one of the main factors that influences its transport capability and remediation capacity. However, studies on the size distribution of nZVI under different environmental conditions are still limited. In this study, the influence of the pH (pH = 5, 7, 9) and ionic strength (IS = 0, 15, 30, 45 mM) on the size distribution of nZVI are investigated. The dynamic light scattering (DLS) method is used to study the variation of the size distribution of nZVI aggregate with time, and batch tests are performed to evaluate the efficiency of phosphate removal. Meanwhile, the phosphate removal capacity of nZVI with different size distribution was examined. Experimental results show that under low IS and high pH conditions, nZVI aggregate exhibited a stable, narrow and one-peak size distribution. By contrast, under high IS and low pH conditions, nZVI exhibited a wide and complicated size distribution with multiple peak values. This different pattern in size distribution was further explained by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The phosphate removal rate of nZVI under acidic and neutral conditions is higher than 98% but is only 68% under alkaline conditions. The phosphate removal capacity is insensitive to the variation of IS since the removal rate is higher than 97% for different IS conditions. Favorable environmental conditions for colloidal stability and removal capacity of nZVI can be different, which needs comprehensive consideration in the application.

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